Concrete cutting device



y 23, 1939: G. w. HIRTH 2,159,699

CONCRETE CUTTING DEVICE Filed March 18, 1939 2 Sheets-Sheet l INVENT OR.

lie-one: IRTH BY I a A ORNEY.

y 23, 1939- G. w. HIRTH 2,159,699

' CONCRETE CUTTING DEVICE Filed March 18, 1939 2 Sheets-Sheet 2INVENTOR. BY Qe'oeq IMQTH I a 1 A ORNEY.

f Patented May 23, 1939 "UNITED STATES PATENT oFFIcE M Q v oononn'rnhirfhm DEVIIOE George w. Hirth, Milwaukee Wis. Application March 18,1939, Serial No. 262,794

8 Claims.-

lMy invention relates to concrete cuttingmachines and more particularlyto a type of machine that may be employed to cutting pre-determinedradius and constructed in a manner to makeit portable so thatit can beconveyed from one job to another.

Another object of my invention is to produce a :device of the characterdescribed that may be 3 mounted on rails or on rubber tires or a combilQnation of both, in which event the rail is the guiding factor indetermining the path of the device. I Q

I Still another object of my invention is to provi'de such a device thatis adaptable to be driven by either anelectric motor or an internalcombustion engine depending on the location and the facilitiesavailable.

A still further object of my invention is to incorporate in the cuttingdevice a surfacing degoTvicewhich may be considered an auxiliaryaccessory making the device adaptable for both cutting and surfacingwithout necessitating complicated mechanical changes. n I

It *is manifest to anyone familiar with the art that a device asspecified and illustrated provided q a very practical means ofaccomplishing the purfpose for which it is intended and the method jemployed for mounting the device affords a very practical means oflowering and raising the con- 1 without any great amount of effort onthe part of 'th eoperator.

V Other and further objects of my invention will [become more apparentas the description pro- 35Qceeds when taken in conjunction with thedrawings which form a part of the specification and inwhich 1 p Figure 1shows a plan view of the device mounted on one track and on rubber tirewheels. This 40pm View also shows both the cutting and surf f facingdevices in position.

i Figure 2 is a cross-sectional view of the device taken at the line 2-2in Figurel illustratingthe manner in which the resilient mem- 45berssupport the device.

c Figure 3 is a fragmentary i the surfacing device. 7 it Figure 4 is anend view of Figure 3.

Figure 5 is a cross-sectional view of the resili- 5[ent support memberstaken at line 5-5 in Fig- .ure 1, and

Figure 6 is a cross-sectional viewof the resilient support members takenat line 6-'6 of Fig- Similar characters of reference indicatecorreperspective view of tact wheels from the surface of the concretesponding parts throughout the several views and referring now to thesame Figure is a plate constituting the body of the device. This plateIn is mounted on a rear axle ll supported on wheels 12 and fastened tothe plate Ill by means i .5 of the bearings l3. The forward end of theplate II] has a recess it in which is positioned a plate l5 pivotallymounted to the plate it on an axle l6 journaled in bearings I! as shown.

A handle l8 fastened to the plate It! at I9 is 10 employed by theoperator to manipulate the de-' vice forward and backward and also byexertring downward pressure to the handle l8 the device may be loweredand raised against the spring pressure of the'resilient members whichare 5 pivotally-supported by bearings 21 on the plate 15 and a crossmember 22 supported by end plates 23 and 23" and journaled therein. InFigure l, I show a rail 24 having fiat members 25 and 25' supporting therail 24 and flanged wheels 26 and 16 supported by the rear axle 2! andthe front axle H. The rear axle 27 is mounted to the plate lfi by meansof bearings 28. There is a driven shaftZS mounted to the plate it bymeans of bearings 33 and-3l'. This driven shaft 29 is 125 actuated andrevolved by means of a belt 3| engaging a pulley 32 on the shaft 29being driven from a pulley 33 mounted onto the power mediu1n34 which isshown as an internal combustion engine in Figures 1 and 2. This howevermay be an electric motor or any other means for furnishing the motivepower. The shaft 29 is shown supporting anabrasive disc 35, heldsecurely by theflanges 36 and Thisa-brasive disc 35 is used as a cuttingmeans for concrete when pressure is applied to the handle l8 forcing theentire device downward andcausing the disc 35 to contact the concretesurface at the point 31. On the other end of the shaft 29 is shown anangular bearing 38, the shaft 29 having a bevelled gear 39 keyedto itsend extends through the angular bearing 38 permitting the gear 39 tocontact another bevelled gear 40 which is mounted to a vertical shaft 4|supported by the depending. end of the angular bearing 33 at 42. Thisarrangement permits the attachment of a surfacing disc 43 to the end ofthe vertical shaft 4| and when the surfacing disc 43 is not to be usedit may be removed from the driven shaft 29 and only the cutting disc 35employed.

In the chosen embodiment of my invention exemplified by the accompanyingdrawings there are present certain novel refinements and improvementsnot heretofore disclosed in the prior art, however, it will be manifestto persons skilled in the art that many changes in the generalarrangement form and configuration of the structure may be made andparts thereof may be varied without departing from the spirit of myinvention as set forth in the appended claims, what I claim and desireto secure by Letters Patent in the United States, is:

1. A device of the character described comprising in combination a body,an auxiliary plate hingedly supported to said body, a pair of wheelsrotatably mounted to said body, a pair of wheels rotatably mounted tosaid auxiliary plate, a handle attached to said body to permit movementof the device on said wheels, resilient members on said body topivotally support said auxiliary plate, an actuating means mounted ontosaid body, a drive shaft, said drive shaft journaled in bearings mountedto said body in a position between the wheels on said body and thehinged support of said auxiliary plate, means for'rotating said drivenshaft from said actuating means when said actuating means is inoperation and a cutting disc mounted to the one end of said drivenshaft, said disc employed for cutting concrete or the like when it isbrought in contact with said concrete by pressure applied against theresilient members.

2. A device as described in claim 1 in combination with a horizontaltrack wherein one of each pair of wheels is flanged so as to permitengagement of said track thereby guiding the device in its forward andbackward path during the cutting operation.

3. A device of the character described comprising in combination a body,an auxiliary plate hingedly supported at one end to said body, a pair ofwheels rotatably mounted to the depending end of said body and saidauxiliary plate, a handle attached to said body to permit the operatorto move the device forward and backward, resilient members mountedbetween said auxiliary plate and said body to pivotally support saidauxiliary plate, power actuated means mounted to said body, a drivenshaft journaled in bearings supported on said body between the wheels onthe depending end of said body and the hinged support of said auxiliaryplate, said'driven shaft provided with a pulley, means for connectingsaid pulley to said actuating means, one end of said driven shaftprovided with a bevelled gear, a vertical shaft, said Vertical shaftprovided with a bevelled gear engaging the gear on said driven shaft anda surfacing disc mounted on the depending end of said vertical shaft forcontact with concrete or the like when said disc is brought down intoengagement by pressure applied against the resilient means on saidauxiliary plate.

4;. A device as described in claim 3 in combination with a horizontalrail, one of each of said pair of wheels flanged to accommodate saidrail thereby guiding the device in its forward and backward path.

5. A device of the character described comprising a horizontal body, anauxiliary plate hingedly supported to said body, wheels rotatablymounted to the depending end of said body and said auxiliary plate,resilient means pivotally supporting said auxiliary plate to said body,a handle attached to said body for use by the operator when conveyingthe device on said wheels, a power operated actuating means mounted onsaid body, a driven shaft journaled in bearings mounted onto said bodyplate at a point between the depending end of said body and saidauxiliary plate mounting, support means for rotating said driven shaftwhen said actuating means is in operation, an abrasive disc, said discmounted to one end of said driven shaft, an angular bearing mounted tothe other end of said driven shaft, a vertical shaft, said angularbearing supporting a pair of bevelled gears operating said verticalshaft, and a surfacing disc, said surfacing disc attached to thedepending lower end of said vertical shaft, both said abrasive disc andsurfacing disc to be slidably mounted so that. either one or the othermay be removed at will,

6. A device as described in claim 5 in combination with a pair of rails,said wheels adapted for engagement with said rails to guide the devicein its forward and backward path when moved by the operator.

'7. A device of the character described, comprising a horizontal body,an auxiliary plate hinged to said body, Wheels rotatably mounted to thedepending ends of said body and auxiliary plate, resilient meanspivotally supporting said auxiliary plate to said body, a handleattached to said body for conveying the device on said wheels, a poweroperated actuating means mounted on said body, a driven shaft, bearingsmounted on said body at a point between the depending end of said bodyand the auxiliary plate mounting, said driven shaft journaled in saidbearings, means for rotating said driven shaft when said operating meansis in action, a cutting saw, said saw slidably mounted onto one end ofsaid driven shaft, an angular bearing pendulously mounted to the otherend of said driven shaft, a vertical shaft journaled in said angularbearing, a pair of bevelled gears on said driven shaft and verticalshaft, said gears engaging one another, and a surfacing disc slidablyattached to the lower end of said vertical shaft for contact with thefloor surface when pressure is applied to said handle.

8. A device as described in claim 7 in combination with one or morerails for guiding the device in its forward and backward path when movedby the operator.

. GEORGE W. I-IIRTH.

